Question

Acid rain occurs when pH value of rain water is less than
..............​

Answer 1

Answer

Acid rain is a rain that is acidic, meaning it has very low pH. When sulfur dioxide and nitrogen oxides are released into the air, they react with water and oxygen and produces sulfuric and nitric acids. These acids then mix with water and result in acid rain. Normal rain water is slightly acidic with a pH range of 5-6. When the pH level of rain water falls below this range, it becomes acid rain. It can have harmful effects on plants, aquatic animals and infrastructure.  

Thus, the correct answer is option D.

Explanation:

4 TO 5

Answer 2

Answer:

The lower a substance pH( less than7)

the more acidic is the hight as substance

PH ( breather than ) 7 the more pH about

5.6' it is lightly acidic because carbon dioxide.

(co² dissolve into,it formatting carbonic acidic.

acid usually has a PH between.

4.2 and 4.4